Introduce DisplayCompositor Mojo API for Mus

components/mus/surfaces/compositor_frame_sink_impl.cc

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "components/mus/surfaces/compositor_frame_sink_impl.h"
+
+#include "cc/surfaces/surface_factory.h"
+#include "components/mus/public/interfaces/compositor_frame.mojom.h"
+#include "components/mus/surfaces/compositor_frame_sink_delegate.h"
+#include "mojo/converters/surfaces/surfaces_type_converters.h"
+
+namespace mus {
+
+namespace {
+
+void CallCallback(
+    const mojo::Callback<void(mojom::CompositorFrameDrawStatus)>& callback,
+    cc::SurfaceDrawStatus draw_status) {
+  callback.Run(static_cast<mojom::CompositorFrameDrawStatus>(draw_status));
+}
+}
+
+CompositorFrameSinkImpl::CompositorFrameSinkImpl(
+    CompositorFrameSinkDelegate* delegate,
+    int sink_id,
+    const scoped_refptr<SurfacesState>& surfaces_state,
+    mojo::InterfaceRequest<mojom::CompositorFrameSink> request,
+    mojom::CompositorFrameSinkClientPtr client)
+    : delegate_(delegate),
+      surfaces_state_(surfaces_state),
+      sink_id_(sink_id),
+      begin_frame_source_(nullptr),
+      needs_begin_frame_(false),
+      factory_(surfaces_state->manager(), this),
+      client_(std::move(client)),
+      binding_(this, std::move(request)) {
+  DCHECK(delegate_);
+  binding_.set_connection_error_handler(base::Bind(
+      &CompositorFrameSinkImpl::OnConnectionLost, base::Unretained(this)));
+}
+
+CompositorFrameSinkImpl::~CompositorFrameSinkImpl() {}
+
+void CompositorFrameSinkImpl::SetNeedsBeginFrame(bool needs_begin_frame) {
+  if (needs_begin_frame_ == needs_begin_frame)
+    return;
+
+  needs_begin_frame_ = needs_begin_frame;
+  if (begin_frame_source_) {
+    if (needs_begin_frame_)
+      begin_frame_source_->AddObserver(this);
+    else
+      begin_frame_source_->RemoveObserver(this);
+  }
+}
+
+void CompositorFrameSinkImpl::SubmitCompositorFrame(
+    mojom::CompositorFramePtr frame,
+    const SubmitCompositorFrameCallback& callback) {
+  // TODO(fsamuel): Validate that SurfaceDrawQuad refer to allowable surface

[rjkroege, 2016/05/19 22:08:38]

the validator should be a delegate.

[Fady Samuel, 2016/05/25 12:37:01]

Acknowledged.

+  // IDs.
+  std::unique_ptr<cc::CompositorFrame> compositor_frame =
+      ConvertToCompositorFrame(frame, nullptr);
+  gfx::Size frame_size =
+      compositor_frame->delegated_frame_data->render_pass_list.back()
+          ->output_rect.size();
+  if (frame_size.IsEmpty() || frame_size != last_submitted_frame_size_) {
+    if (!surface_id_.is_null())
+      factory_.Destroy(surface_id_);
+    // TODO(fsamuel): The allocator should live on CompositorFrameSinkFactory.
+    surface_id_ = delegate_->GenerateSurfaceId();
+    factory_.Create(surface_id_);
+    last_submitted_frame_size_ = frame_size;
+  }
+  factory_.SubmitCompositorFrame(surface_id_, std::move(compositor_frame),
+                                 base::Bind(&CallCallback, callback));
+}
+
+void CompositorFrameSinkImpl::ReturnResources(
+    const cc::ReturnedResourceArray& resources) {
+  if (!client_)
+    return;
+
+  client_->ReturnResources(
+      mojo::Array<mojom::ReturnedResourcePtr>::From(resources));
+}
+
+void CompositorFrameSinkImpl::SetBeginFrameSource(
+    cc::BeginFrameSource* begin_frame_source) {
+  begin_frame_source_ = begin_frame_source;
+}
+
+void CompositorFrameSinkImpl::OnBeginFrame(const cc::BeginFrameArgs& args) {
+  // TODO(fsamuel): Implement this.
+}
+
+const cc::BeginFrameArgs& CompositorFrameSinkImpl::LastUsedBeginFrameArgs()
+    const {
+  // TODO(fsamuel): Implement this.
+  return last_used_begin_frame_args_;
+}
+
+void CompositorFrameSinkImpl::OnBeginFrameSourcePausedChanged(bool paused) {
+  // TODO(fsamuel): Implement this.
+}
+
+void CompositorFrameSinkImpl::OnConnectionLost() {
+  delegate_->CompositorFrameSinkConnectionLost(sink_id_);
+}
+
+}  // namespace mus